用簡便方法計算下列各題要有過程,脫式計算

2021-03-04 08:56:07 字數 6754 閱讀 2412

1樓:匿名使用者

0.78×98

=0.78×(100-2)

=0.78×100-0.78×2

=78-1.56

=76.44

3.6×1.9+0.36×81

=3.6×1.9+3.6×8.1

=3.6×(1.9+8.1)

=3.6×10

=367.6×2.4+6.

5×7.6+7.6+0.

76=7.6×2.4+7.

6×6.5+7.6×1+7.

6×0.1=7.6×(2.

4+6.5+1+0.1)

=7.6×10=76

有100道脫式簡便計算題帶答案和過程嗎

2樓:瑞安丫

1. 0.4×125×25×0.8 =(0.4×25)×(125×0.8)=10×100=1000

2. 1.25×(8+10)=1.25×8+1.25×10 =10+12.5=22.5

3.9123-(123+8.8)=9123-123-8.8=9000-8.8=8991.2

4.1.24×8.3+8.3×1.76 =8.3×(1.24+1.76) =8.3×3=24.9

5.9999×1001

=9999×(1000+1)

=9999×1000+9999×1

=10008999

6. 14.8×6.3-6.3×6.5+8.3×3.7

=(14.8-6.5)×6.3+8.3×3.7

=8.3×6.3+8.3×3.7

=8.3×(6.3+3.7)

=8.3×10

=837. 1.24+0.78+8.76

=(1.24+8.76)+0.78

=10+0.78

=10.78

8. 933-157-43 =933-(157+43) =933-200 =733

9. 4821-998

=4821-1000+22=3823

10. 32×125×25

=4×8×125×25

=(4×25)×(8×125)

=100×1000

=100000 9048÷26

=(2600+2600+2600+1248)÷26

=2600÷26+2600÷26+2600÷26+1248÷26

=100+100+100+48

=348

11. 2881÷ 43

=(1290+1591)÷ 43

=1290÷43+1591÷43

=30+37 =67 3.2×42.3×3.75-12.5×0.423×16

=3.2×42.3×3.75-1.25×42.3×1.6

=42.3×(3.2×3.75-1.25×1.6)

=42.3×(4×0.8×3.75-1.25×4×0.4)

=42.3×(4×0.4×2×3.75-1.25×4×0.4)

=42.3×(4x0.4x7.5-1.25x4x0.4)

=42.3×[4×0.4×(7.5-1.25)]

=42.3×[4×0.4×6.25]

=42.3×(4×2.5) =423

12. 1.8+18÷1.5-0.5×0.3 =1.8+12-0.15=13.8-0.15 =13.65

13. 6.5×8+3.

5×8-47 =52+28-47 =80-47 =33 (80-9.8)×5分之2-1.32 =70.

2x2/5-1.32=28.08-1.

32 =26.76

14. 8×7分之4÷[1÷(3.2-2.95)] =8×4/7÷[1÷0.25]=8×4/7÷4  =8/7

15. 2700×(506-499)÷900 =2700×7÷900 =18900÷900 =21

16. 33.02-(148.4-90.85)÷2.5=33.02-57.55÷2.3=33.02-23.02=10

17. (1÷1-1)÷5.1 =(1-1)÷5.1 =0÷5.1 =0

18. 18.1+(3-0.299÷0.23)×1=18.1+1.7×1 =18.1+1.7 =19.8

19.  9000÷72×(1.25×0.7×8)=9000÷72×7=125×7=875

20. 61-(1.25+2.5×0.7)=61-3=58

21. [(10-0.8)+9.85]-2÷0.125=19.05-2÷0.125=19.05-16=13.05

22. 5.4÷1.8+240×1.5=3+360=363

23. 9000÷72×(1.25×0.7×8)=9000÷72×7=125×7=875

24. 61-(1.25+2.5×0.7)=61-3=58

25. [(10-0.8)+9.85]-2÷0.125=19.05-2÷0.125=19.05-16=3.05

26. 408-12×24= 408 - 288= 120

27. (46+28)×60= 74 x 60= 4440

28. 42×50-17 = 2100- 17 = 2083

29. 32+105÷5 = 32 + 21= 53

30. 420×(327-238) = 420 x 89 = 37380

31. (4121+2389)÷7 = 6510 ÷7 = 930

32. 3.416÷(0.016×35) = 3.416 ÷0.56 = 6.1

33. 0.8×[(10-6.76)÷1.2] = 0.8 x(3.24÷1.2) = 0.8 x 2.7 = 2.16

34. 5.67×0.2-0.62 = 1.134-0.62 = 0.514

35.0.4×0.7×0.25 = 0.4 x 0.2 5 x 0.7 = 0.1 x 0.7 = 0.07

36. 0.78+5.436+1 = 6.216 +1 = 7.216

37. 30.8÷[14-(9.85+1.07)] = 30.8 ÷ (14 - 10.92) = 30.8÷3.08 = 10

38. [60-(9.5+28.9)]÷0.18 = (60- 38.4)÷0.18 = 21.6 ÷0.18 = 120

39. 2.881÷0.43-0.24×3.5 = 6.7 - 0.24 x3.5 = 6.7 - 0.84 = 5.86

40. 20×[(2.44-1.

8)÷0.4+0.15] = 20x (0.

64 ÷0.4 +0.15)= 20x(1.

6 +0.15) = 20 x1.75 = 35

41. 28-(3.4+1.25×2.4) = 28 - (3.4 + 3) = 28 - 6.4 = 21.6

42. 2.55×7.1+2.45×7.1 = (2.55 + 2.45) x7.1 = 5 x7.1=35.5

43. 0.8×〔15.5-(3.21+5.79)〕 = 0.8 x (15.5 - 9) = 0.8 x 6.5 = 5.2

44.(31.8+3.2×4)÷5 = (31.8 + 12.8)÷5 = 44.6÷5 = 8.92

45. 31.5×4÷(6+3) = 126 ÷ 9 = 14

46. 2÷2.5+2.5÷2 = 0.8 + 1.25 =2.05

47. 194-64.8÷1.

8×0.9 = 194 -36 x0.9 = 194-32.

4 = 161.65180-705×6 = 5180 - 4230=950

48. 24÷2.4-2.5×0.8 =10 -2=8

49. 405×(3213-3189) =405x24 = 9720

59. 125×(97-81) =125x16 =2000

60. 6942+480÷3 = 6942 + 160 = 6782

61. 20+80÷4-20 = 20 + 20 -20 = 40 -20 = 20

62. 100÷(32-30)×0 = 100 ÷2 x0= 50 x0 = 0

63. 25×4-12×5 = 100 - 60 = 40

64. 70×〔(42-42)÷18〕=70 x (0÷18) = 70x0 = 0

65. 75×65+75×35 = 75 x (65 +35) = 75x100 = 7500

66. 6-1.6÷4= 6- 0.4 = 5.6

67. 5.38+7.85-5.37= 13.23 - 5.37=7.86

68. 7.2÷0.8-1.2×5=9 - 6 =3

69. 6-1.19×3-0.43= 6-3.57 - 0.43 = 6- (3.57 + 0.43) = 6-4 = 2

70. 6.5×(4.8-1.2×4)= 6.5 x(4.8 - 4.8 )=6.5 x0 = 0

71. 0.68×1.9+0.32×1.9 = (0.68 + 0.32) x1.9 = 1 x 1.9 = 1.9

72. 10.15-10.

75×0.4-5.7 = 10.

15 - 4.3 - 5.7 = 10.

15 -(4.3 + 5.7)=10.

15 - 10 =0.15

73. 5.8×(3.

87-0.13)+4.2×3.

74 = 5.8 x 3.74 +4.

2 x 3.74 = (5.8 +4.

2)x3.74 = 10 x 3.74 = 37.

474. 32.52-(6+9.

728÷3.2)×2.5 = 32.

52 - (6+3.04)x2.5 = 32.

52 - 9.02 x 2.5 = 32.

52 -22.55 = 9.97

75.(136+64)×(65-345÷23)= 200x(65-15) = 200x 50=10000

76. 0.4×125×25×0.8 =(0.4×25)×(125×0.8)=10×100=1000

77. 1.25×(8+10) =1.25×8+1.25×10=10+12.5=22.5

78. 9123-(123+8.8) =9123-123-8.8=9000-8.8=8991.2

79. 1.24×8.3+8.3×1.76 =8.3×(1.24+1.76)=8.3×3=24.9

80. 9999×1001 =9999×(1000+1)=9999×1000+9999×1 =10008999

81. 14.8×6.

3-6.3×6.5+8.

3×3.7 =(14.8-6.

5)×6.3+8.3×3.

7=8.3×6.3+8.

3×3.7

82. 8.3×(6.3+3.7) =8.3×10 =83

83. 1.24+0.78+8.76 =(1.24+8.76)+0.78 =10+0.78 =10.78

84. 933-157-43 =933-(157+43)=933-200=733

85. 4821-998 =4821-1000+2=3823

86. i32×125×25 =4×8×125×25  =(4×25)×(8×125)=100×1000 =100000

87. 9048÷268

=(2600+2600+2600+1248)÷26

=2600÷26+2600÷26+2600÷26+1248÷269

=100+100+100+48

=348

88. 2881÷ 43 =(1290+1591)÷ 434=1290÷43+1591÷43=30+37

89. 1.8+18÷1.5-0.5×0.3 =1.8+12-0.15=13.8-0.15=13.65

90. 6.5×8+3.5×8-47 =52+28-47=80-47

91. (80-9.8)×5分之2-1.32 =70.2x2/5-1.32=28.08-1.32=26.76

92. 8×7分之4÷[1÷(3.2-2.95)]=8×4/7÷[1÷0.25]=8×4/7÷4=8/7

93. 2700×(506-499)÷900 =2700×7÷900 =18900÷900 =21

94. 33.02-(148.4-90.85)÷2.5=33.02-57.55÷2.5=33.02-23.02 =10

95. (1÷1-1)÷5.1 =(1-1)÷5.1 =0÷5.1 =0

96. 18.1+(3-0.299÷0.23)×1=18.1+1.7×1 =18.1+1.7 =19.8

97. 4.1/27+505/2727+131313/272727 =1/27+5*101/(27*101)+13*10101/(27*10101)

=1/27+5/27+13/27=19/27

98. 6.5×8+3.5×8-47 =52+28-47=80-47

99. (80-9.8)×5分之2-1.32 =70.2x2/5-1.32=28.08-1.32=26.76

100. 1.8+18÷1.5-0.5×0.3 =1.8+12-0.15=13.8-0.15=13.65

延展回答

脫式計算即遞等式計算,把計算過程完整寫出來的運算,也就是脫離橫式的計算。

在計算混合運算時,通常是一步計算乙個算式(逐步計算,等號不能寫在原式上),要寫出每一步的過程。一般來說,等號要往前,不與第一行對齊。也就是離開原式計算。

(脫字念tuo)主要掌握的是記住要先算乘、除法,後算加、減法。在乘除法連續計算時中,要按從左往右的順序依次計算。遇到括號,要首先計算括號內部。

在脫式過程中要按運算順序劃出運算順序線,還要做到"三核對",一要核對從書上把題抄到作業本上數字、符號是否抄對。二要核對從橫式抄到草稿豎式的數字、符號是否抄對。三要核對把草稿豎式上的得數,抄到橫式上是否抄對,小數點是否點對地方,有無遺漏。

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